From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Tue, 27 Mar 2012 22:03:19 +0000 (+0000)
Subject: Add two missed instcombines related to compares with nsw arithmetic.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=c8591a451a41627f2db13ac849f2b00272b7a898;p=oota-llvm.git

Add two missed instcombines related to compares with nsw arithmetic.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153542 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index 1f69ffb09c0..2d4925d307a 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -961,6 +961,18 @@ optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
 
 //===---------------------------------------------------------------------===//
 
+int g(int x) { return (x - 10) < 0; }
+Should combine to "x <= 9" (the sub has nsw).  Currently not
+optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
+
+//===---------------------------------------------------------------------===//
+
+int g(int x) { return (x + 10) < 0; }
+Should combine to "x < -10" (the add has nsw).  Currently not
+optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
+
+//===---------------------------------------------------------------------===//
+
 This was noticed in the entryblock for grokdeclarator in 403.gcc:
 
         %tmp = icmp eq i32 %decl_context, 4